Numerical simulation of the hot-tail runaway electron production mechanism using CQL3D and comparison with Smith–Verwichte analytical model

ABSTRACTGeneral features of the steady-state photocarrier grating technique applied to amorphous semiconductors are investigated by complete numerical simulation. The results are interpreted with an analytical model which delivers a closed-form expression for β(A,E) assuming dominance of one carrier type. The variation of the electric field E instead of the grating period A is suggested as an easier and more accurate tool for the experimental technique.

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Fatigue Reinforcement of Steel Elements by CFRP Materials: Experimental Evidence, Analytical Model and Numerical Simulation

Procedia Engineering ◽

10.1016/j.proeng.2014.06.284 ◽

2014 ◽

Vol 74 ◽

pp. 384-387 ◽

Cited By ~ 3

Author(s):

Pierluigi Colombi ◽

Giulia Fava ◽

Carlo Poggi ◽

Lisa Sonzogni

Keyword(s):

Numerical Simulation ◽

Experimental Evidence ◽

Analytical Model

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Analytical Prediction of the Cross-Over Point in the Temperature Coefficient of the Forward Characteristics of 4H−SiC p+−i−n Diodes

Materials Science Forum ◽

10.4028/www.scientific.net/msf.821-823.628 ◽

2015 ◽

Vol 821-823 ◽

pp. 628-631

Author(s):

Luigi di Benedetto ◽

Gian Domenico Licciardo ◽

Salvatore Bellone ◽

Roberta Nipoti

Keyword(s):

Experimental Data ◽

Numerical Simulation ◽

Temperature Coefficient ◽

Analytical Model ◽

Simple Formula ◽

Carrier Lifetime ◽

Analytical Prediction ◽

First Order ◽

Different Temperatures ◽

Crossing Point

ForwardJD–VDcurves of 4H−SiC p−i−n diodes are analyzed by means of an analytical model in order to justify the presence of a crossing−point. The interlacing behaviour occurring in theJD–VDcurves of 4H−SiC diodes at different temperatures is predicted by a simple formula, which can be used for a first-order design of such devices. Numerical simulation of diodes designed with different epilayer thickness and carrier lifetime values have been used in order to analyze the crossing−point behaviour. Comparisons with experimental data confirm the analytic and simulated results.

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Multi-layered diffusive convection. Part 2. Dynamics of layer evolution

Journal of Fluid Mechanics ◽

10.1017/s0022112010994160 ◽

2010 ◽

Vol 651 ◽

pp. 465-481 ◽

Cited By ~ 7

Author(s):

TAKASHI NOGUCHI ◽

HIROSHI NIINO

Keyword(s):

Numerical Simulation ◽

Numerical Model ◽

Direct Numerical Simulation ◽

Analytical Model ◽

The Other ◽

One Dimensional ◽

Turbulent Entrainment ◽

Diffusive Convection ◽

Two Component

Evolution of layers in an unbounded diffusively stratified two-component fluid and its dynamics are studied by means of a direct numerical simulation (DNS) and an analytical model. The numerical simulation shows that the layers grow by repeating mergings with the neighbouring layers. By analysing the results of the numerical simulation, the mechanism of the merging is examined in detail. Two modes of merging are found to exist: one is the layer vanishing mode and the other is the interface vanishing mode. The vanishings of layers and interfaces are caused by turbulent entrainment at the interfaces. Based on the analysis of the numerical model, a one-dimensional asymmetric entrainment model is proposed. In the model, each layer is assumed to interact with its neighbouring layers through simplified convective entrainment laws. The model is applied to two simple configurations of layers and is proved to reproduce the layer evolutions found in the DNS successfully.

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Numerical Simulation of Engaging Process of Friction Plate (1st Report, Analytical Model for Numerical Simulation)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C ◽

10.1299/kikaic.73.2149 ◽

2007 ◽

Vol 73 (731) ◽

pp. 2149-2155 ◽

Cited By ~ 1

Author(s):

Hiroshi YABE ◽

Atsushi TAKAHASHI ◽

Yorinori KUMAGAI

Keyword(s):

Numerical Simulation ◽

Analytical Model ◽

Friction Plate

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Generalized graphic-analytical model for evaluation of the fatality / structural collapse production mechanism on a building affected by an explosion

MATEC Web of Conferences ◽

10.1051/matecconf/202235400033 ◽

2022 ◽

Vol 354 ◽

pp. 00033

Author(s):

Gabriel Vasilescu ◽

Attila Kovacs ◽

Ciprian Jitea ◽

Doru Anghelache ◽

Florian Stoian

Keyword(s):

Mathematical Model ◽

Risk Assessment ◽

Protected Areas ◽

Analytical Model ◽

Explosive Charge ◽

Quantitative Risk Assessment ◽

Production Mechanism ◽

Structural Collapse ◽

Analysis And Evaluation ◽

Occupational Risks

The paper highlights the generalized grapho-analytical model of analysis and evaluation of the mechanism of occurrence of the event scenario for the production of fatality/structural collapse in the case of a building affected by explosion. This mathematical model is based on research results in the field of civil explosives for the technological/occupational risks estimation and assessment, as well as threats to the security of protected areas that may be vulnerable through acts of malice. The process of quantitative risk assessment associated with explosion phenomena as a result of the detonation of an explosive charge, allows estimating result indicators based on the use of algorithms and models specific to associated hazards, in order to model the effects and consequences of event scenarios.

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Normalization of double-circuit overhead line magnetic field inside Khrushchev building

Electrical Engineering & Electromechanics ◽

10.20998/2074-272x.2021.3.06 ◽

2021 ◽

pp. 38-41

Author(s):

K. V. Chunikhin ◽

V. S. Grinchenko

Keyword(s):

Magnetic Field ◽

Numerical Simulation ◽

Analytical Model ◽

Reference Level ◽

Overhead Line ◽

Field Normalization ◽

Living Space ◽

The Magnetic Field

This paper deals with the mitigation of 110 kV double-circuit overhead line magnetic field inside five-story Khrushchev buildings. We show that the magnetic field can exceed the reference level 0.5 μT in 90 % part of living space. To mitigate the magnetic field, we propose the inverted L-shaped grid shield with conductors on the wall and in the attic of the building. Using the analytical model of the grid shield and the numerical simulation, we determine the parameters of the L-shaped grid shield which provides the magnetic field normalization in 97 % part of living space. Further improvement of the grid shield profile, in particular, the placement of some conductors in the basement, allows to reduce the quantity of metal of the shield by 15 % while maintaining the shielding efficiency. Also we consider the magnetic field normalization for the overhead line with a rated current of 500 A. In this case, the quantity of metal of the grid shield increases 2.74 times.

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